I had the same problem and the only way I could trun the TV off was to unplug it. I took it to a shop and they said it needed a Main board/ A board. They seemed to think that it was a victim of a power surge. The part is around $170 used and $500 new. It is a very rare board so i am still looking for a used one. The part number is TNPH0716ABS.
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